Why are mechanical hearts hard to make?

12 July 2013
Presented by Chris Smith, Redi Tlhabi.

Why are we ticklish? What happens to blood when we die? Why are mechanical hearts hard to make? What's a burb? Can a mushroom crack tarmac? Why do helium balloons fly forwards in the car when I brake? Why does microwaved milk explode when I stir it?

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